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使用差氏扫描量热仪、维氏显微硬度计和扫描电子显微镜研究了过冷液相区内不同温度等温退火处理对Zr-Al-CuNi-Ag块体非晶合金的显微硬度和剪切带形核、扩展的影响。结果表明,等温退火处理后非晶合金的初晶相为二十面体准晶相(I-相),其体积分数随着退火温度的升高呈现上升的趋势;复合材料的显微硬度随着晶化体积分数的升高呈现增大的趋势;界面压痕下方剪切带密度随着晶化体积分数的升高则呈现下降的趋势。这是等温退火导致非晶合金发生结构弛豫和第二相析出综合作用的结果。
The microhardness and shear strength of Zr-Al-CuNi-Ag bulk amorphous alloys treated by isothermal annealing at different temperatures in supercooled liquid region were investigated using differential scanning calorimeter, Vickers microhardness tester and scanning electron microscope Cut the nucleus, the impact of expansion. The results show that the initial phase of the amorphous alloy after isothermal annealing treatment is icosahedral quasicrystalline phase (I-phase), the volume fraction of which increases with annealing temperature; the microhardness of the composites increases with The increase of crystallized volume fraction showed an increasing trend. The shear zone density under the interface indentation tended to decrease with the increase of crystallized volume fraction. This is the result of the isothermal annealing resulting in the structural relaxation of the amorphous alloy and the combined effect of the second phase precipitation.